I just ordered a 6BR in a CBI. I got mine in 28in Varmint taper with an 8 twist. I am glad to hear that yours is showing promise, I am planning on CCI 450, bout some Lapua brass, and gonna try some 100gr Seirras, 62gr Varmint Grenades, and some 58gr V-Maxs and if none of that shows promise I will try some 75 V-Maxs and some 105 A-Maxs. Got plenty of Varget to try and a few others to try. Keep us up to speed on what you find that works.